Vertical Venting - Nordyne + RC 92+ Installation Instructions Manual

4. Insure the combustion air inlet pipe (for a 2
pipe installation) has a 90 degree termination
elbow as shown in Figures 21 and 22.
Vent Configuration to
Provide 12" Minimum
height above
Snow Level.
Outside
Wall
Figure 21. Alternate Horizontal
Vent Installation
Winter Design
Termperature (°F)
20
0
-20
‡ = Insulation thickness greater than 3/8 inch, based on an
R value of 3.5 (ft*°F*hr)/(BTU*in)
Mounting Kit
Faceplate Secured
to Wall with Screws
Combustion
Air Inlet
Exhaust Vent
Option C
Figure 22. Exhaust and Combustion Air Pipe Clearances
12" Min.
19" Max.
Support
12" Above
Normally
Expected
Snow
1/2"
Level
Armaflex
Insulation or
Equivalent
(If Required)
Maximum Flue Pipe Length in
Unconditioned and Exterior Spaces
Without Insulation
(feet)
45
20
10
Table 6. Vent Protection
Exhaust Vent
Option B
18" Min.
36" Max.
18" Min.
36" Max.
7" Min.
Note: A combustion air intake must be provided
with an elbow opening downward. The screen
provided with the furnace must be installed in the
elbow to prevent entry of debris or creatures.
When the vent pipe must exit an exterior wall
close to the grade or expected snow level, a riser
should be provided as shown in Figure 20.
Table 6 describes the maximum length of fl ue pipe
that can travel through an unconditioned space
or an exterior space. The total vent length must
not exceed the lengths noted on Table 5.

Vertical Venting

Figure 23 shows the proper installation and
clearances for vertical vent termination. The
roof penetration must be properly fl ashed and
waterproofed with a plumbing roof boot or equiva-
lent fl ashing. Termination spacing requirements
from the roof and from each other must be per
Figure 23.
With Insulation
(feet) ‡
70
70
60
Exhaust Vent
Option A
8" Min.
18" min.
36" max.
Grade
Level
or Normal
12" Min. to
Snow
Normal Snow Level
Inlet Exhaust
25